Libav
sol.c
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1 /*
2  * Sierra SOL demuxer
3  * Copyright Konstantin Shishkov
4  *
5  * This file is part of Libav.
6  *
7  * Libav is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * Libav is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with Libav; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 /*
23  * Based on documents from Game Audio Player and own research
24  */
25 
27 #include "libavutil/intreadwrite.h"
28 #include "avformat.h"
29 #include "internal.h"
30 #include "pcm.h"
31 
32 /* if we don't know the size in advance */
33 #define AU_UNKNOWN_SIZE ((uint32_t)(~0))
34 
35 static int sol_probe(AVProbeData *p)
36 {
37  /* check file header */
38  uint16_t magic = AV_RL32(p->buf);
39  if ((magic == 0x0B8D || magic == 0x0C0D || magic == 0x0C8D) &&
40  p->buf[2] == 'S' && p->buf[3] == 'O' &&
41  p->buf[4] == 'L' && p->buf[5] == 0)
42  return AVPROBE_SCORE_MAX;
43  else
44  return 0;
45 }
46 
47 #define SOL_DPCM 1
48 #define SOL_16BIT 4
49 #define SOL_STEREO 16
50 
51 static enum AVCodecID sol_codec_id(int magic, int type)
52 {
53  if (magic == 0x0B8D)
54  {
55  if (type & SOL_DPCM) return AV_CODEC_ID_SOL_DPCM;
56  else return AV_CODEC_ID_PCM_U8;
57  }
58  if (type & SOL_DPCM)
59  {
60  if (type & SOL_16BIT) return AV_CODEC_ID_SOL_DPCM;
61  else if (magic == 0x0C8D) return AV_CODEC_ID_SOL_DPCM;
62  else return AV_CODEC_ID_SOL_DPCM;
63  }
64  if (type & SOL_16BIT) return AV_CODEC_ID_PCM_S16LE;
65  return AV_CODEC_ID_PCM_U8;
66 }
67 
68 static int sol_codec_type(int magic, int type)
69 {
70  if (magic == 0x0B8D) return 1;//SOL_DPCM_OLD;
71  if (type & SOL_DPCM)
72  {
73  if (type & SOL_16BIT) return 3;//SOL_DPCM_NEW16;
74  else if (magic == 0x0C8D) return 1;//SOL_DPCM_OLD;
75  else return 2;//SOL_DPCM_NEW8;
76  }
77  return -1;
78 }
79 
80 static int sol_channels(int magic, int type)
81 {
82  if (magic == 0x0B8D || !(type & SOL_STEREO)) return 1;
83  return 2;
84 }
85 
87 {
88  unsigned int magic,tag;
89  AVIOContext *pb = s->pb;
90  unsigned int id, channels, rate, type;
91  enum AVCodecID codec;
92  AVStream *st;
93 
94  /* check ".snd" header */
95  magic = avio_rl16(pb);
96  tag = avio_rl32(pb);
97  if (tag != MKTAG('S', 'O', 'L', 0))
98  return -1;
99  rate = avio_rl16(pb);
100  type = avio_r8(pb);
101  avio_skip(pb, 4); /* size */
102  if (magic != 0x0B8D)
103  avio_r8(pb); /* newer SOLs contain padding byte */
104 
105  codec = sol_codec_id(magic, type);
106  channels = sol_channels(magic, type);
107 
108  if (codec == AV_CODEC_ID_SOL_DPCM)
109  id = sol_codec_type(magic, type);
110  else id = 0;
111 
112  /* now we are ready: build format streams */
113  st = avformat_new_stream(s, NULL);
114  if (!st)
115  return -1;
117  st->codec->codec_tag = id;
118  st->codec->codec_id = codec;
119  st->codec->channels = channels;
120  st->codec->channel_layout = channels == 1 ? AV_CH_LAYOUT_MONO :
122  st->codec->sample_rate = rate;
123  avpriv_set_pts_info(st, 64, 1, rate);
124  return 0;
125 }
126 
127 #define MAX_SIZE 4096
128 
130  AVPacket *pkt)
131 {
132  int ret;
133 
134  if (s->pb->eof_reached)
135  return AVERROR(EIO);
136  ret= av_get_packet(s->pb, pkt, MAX_SIZE);
137  if (ret < 0)
138  return ret;
139  pkt->stream_index = 0;
140 
141  /* note: we need to modify the packet size here to handle the last
142  packet */
143  pkt->size = ret;
144  return 0;
145 }
146 
148  .name = "sol",
149  .long_name = NULL_IF_CONFIG_SMALL("Sierra SOL"),
150  .read_probe = sol_probe,
151  .read_header = sol_read_header,
152  .read_packet = sol_read_packet,
153  .read_seek = ff_pcm_read_seek,
154 };
Bytestream IO Context.
Definition: avio.h:68
enum AVCodecID id
Definition: mxfenc.c:84
void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: utils.c:2829
AVInputFormat ff_sol_demuxer
Definition: sol.c:147
int size
Definition: avcodec.h:974
#define AV_CH_LAYOUT_STEREO
Format I/O context.
Definition: avformat.h:922
#define SOL_16BIT
Definition: sol.c:48
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:2521
#define SOL_STEREO
Definition: sol.c:49
uint32_t tag
Definition: movenc.c:844
static int sol_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: sol.c:129
int av_get_packet(AVIOContext *s, AVPacket *pkt, int size)
Allocate and read the payload of a packet and initialize its fields with default values.
Definition: utils.c:117
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: avcodec.h:105
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:564
#define AVERROR(e)
Definition: error.h:43
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:145
uint64_t channel_layout
Audio channel layout.
Definition: avcodec.h:1868
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:443
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:718
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:397
audio channel layout utility functions
static int sol_codec_type(int magic, int type)
Definition: sol.c:68
#define MAX_SIZE
Definition: sol.c:127
static av_always_inline int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: avio.h:210
static int sol_read_header(AVFormatContext *s)
Definition: sol.c:86
static enum AVCodecID sol_codec_id(int magic, int type)
Definition: sol.c:51
#define AV_RL32
Definition: intreadwrite.h:146
int ff_pcm_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
Definition: pcm.c:26
Stream structure.
Definition: avformat.h:699
NULL
Definition: eval.c:55
enum AVMediaType codec_type
Definition: avcodec.h:1058
enum AVCodecID codec_id
Definition: avcodec.h:1067
int sample_rate
samples per second
Definition: avcodec.h:1807
AVIOContext * pb
I/O context.
Definition: avformat.h:964
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
Definition: avcodec.h:1082
static int sol_probe(AVProbeData *p)
Definition: sol.c:35
This structure contains the data a format has to probe a file.
Definition: avformat.h:395
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:404
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:548
Main libavformat public API header.
static int sol_channels(int magic, int type)
Definition: sol.c:80
int eof_reached
true if eof reached
Definition: avio.h:96
int channels
number of audio channels
Definition: avcodec.h:1808
#define SOL_DPCM
Definition: sol.c:47
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:525
int stream_index
Definition: avcodec.h:975
#define AV_CH_LAYOUT_MONO
#define MKTAG(a, b, c, d)
Definition: common.h:238
This structure stores compressed data.
Definition: avcodec.h:950